[Sip] cnonce in RFC 3261

[Moloud Mousavi <[e-mail]>]

Hi,

The Cnonce definition in RFC 3261 is confusing. This is what I found:

cnonce = "cnonce" EQUAL cnonce-value
cnonce-value = nonce-value


while a bit up an example shows the value of cnonce different than nonce:

nonce="dcd98b7102dd2f0e8b11d0f600bfb0c093",
uri="sip:[e-mail]",
qop=auth,
nc=00000001,
cnonce="0a4f113b",
response="6629fae49393a05397450978507c4ef1",

I need to calculate the challenge response. I don't know where to get this cnonce from?

One more thing: Why are there many names for the same parameter??? Like this one: nonce-count = "nc" EQUAL nc-value


THANKs a lot.

Moloud




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